ant-design/components/dropdown/demo/arrow.md
MadCcc e5451a95cb
feat: dropdown support arrow pointing at center (#33658)
* feat: add pointAtCenter prop for dropdown

* feat: dropdown support arrow pointing at center

* chore: code clean

* chore: use getPlacements in tooltip

* feat: dropdown support 'top' and 'bottom'

* chore: update snapshot

* chore: move placements to util folder

* feat: make 'topCenter' and 'bottomCenter' in Dropdown deprecated

* test: update snapshot

* test: add test for topCenter and bottomCenter
2022-01-13 13:34:34 +08:00

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---
order: 2
title:
zh-CN: 箭头
en-US: Arrow
---
## zh-CN
可以展示一个箭头。
## en-US
You could display an arrow.
```jsx
import { Menu, Dropdown, Button } from 'antd';
const menu = (
<Menu>
<Menu.Item>
<a target="_blank" rel="noopener noreferrer" href="https://www.antgroup.com">
1st menu item
</a>
</Menu.Item>
<Menu.Item>
<a target="_blank" rel="noopener noreferrer" href="https://www.aliyun.com">
2nd menu item
</a>
</Menu.Item>
<Menu.Item>
<a target="_blank" rel="noopener noreferrer" href="https://www.luohanacademy.com">
3rd menu item
</a>
</Menu.Item>
</Menu>
);
ReactDOM.render(
<>
<Dropdown overlay={menu} placement="bottomLeft" arrow>
<Button>bottomLeft</Button>
</Dropdown>
<Dropdown overlay={menu} placement="bottom" arrow>
<Button>bottom</Button>
</Dropdown>
<Dropdown overlay={menu} placement="bottomRight" arrow>
<Button>bottomRight</Button>
</Dropdown>
<br />
<Dropdown overlay={menu} placement="topLeft" arrow>
<Button>topLeft</Button>
</Dropdown>
<Dropdown overlay={menu} placement="top" arrow>
<Button>top</Button>
</Dropdown>
<Dropdown overlay={menu} placement="topRight" arrow>
<Button>topRight</Button>
</Dropdown>
</>,
mountNode,
);
```
```css
#components-dropdown-demo-arrow .ant-btn {
margin-right: 8px;
margin-bottom: 8px;
}
.ant-row-rtl #components-dropdown-demo-arrow .ant-btn {
margin-right: 0;
margin-bottom: 8px;
margin-left: 8px;
}
```